Adjectives append to the noun they are modifying; the adverbs that modify a single word append similarly; adverbs that modify more than one word stand alone, but are placed beside the words they intend to modify.

All modifiers are given the special affix -ya, which appends to the end of the word being modified (in the case of multi-word modifiers, -ya appends to the modifier itself).

The big dog = kif ligarksya.

“Dog-piling”: In Thoul, if a word is being modified by more than one adjective/adverb these modifiers “dog-pile” onto the word in a chain-like fashion.

The big, old, hairy dog = kif ligiyoliruckearksya.

Note, in the above example, that only the modifier closest to the “dog-piled” word conjugates like a typical modifier (with -ya coming after the word); the modifiers that come before have their -ya appended directly to themselves in the form of -i-.